Magento Shipping issue

Hello coders, I have setup a magento store and everything is working except I get to the point to 'proceed order' after that the onepage checkout gives me an error. Checking the error says that it has something to do with the shipping module, within the State/Privince section setup but I have no clue how to resolve this issue on the onepage-checkout...I didn’t change anything in functionality in the ‘[login to view URL]’ and I'm getting a lil bit insane here =) In order to get the error you have to go to: [login to view URL] add any product and go via top-menu to checkout, after clicking 'proceed order' the error occurs. It must be a simple setting which I'm missing so anybody who knows whats going on please feel free to bid! Thanks.